const curRes = this.stack.length ? i - this.stack[this.stack.length - 1] : i + 1;
Фото: Алексей Филиппов / РИА Новости，更多细节参见新收录的资料
Mark SavageMusic correspondent，这一点在新收录的资料中也有详细论述
When it comes to flexibility, robot vacuums do things differently than standard ones. You can control some with your smartphone, set cleaning schedules and more, but robo-vacs are primarily tasked with cleaning floors. On the flip side, their upright counterparts can come with various attachments that let you clean couches, stairs, light fixtures and other hard-to-reach places.，详情可参考新收录的资料
“沙中共绘文化交流新画卷。”沙特《利雅得报》专栏作家萨拉赫·卡尼说，“系列活动的举行增进了两国民心相通。”